Know all about Obsidian and Picrite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian and Picrite belong to Igneous Rocks.Texture of Obsidian is Glassy whereas that of Picrite is Earthy, Rough. Obsidian appears Shiny and Picrite appears Rough and Shiny. The luster of Obsidian is vitreous while that of Picrite is subvitreous to dull. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo).